2 – Control Module Design
The control module measures just 91mm x 87mm x 23mm. It has a very quiet, brushless fan
which provides sufficient cooling for the three A4988 stepper motor drivers, which have a
common aluminium heat sink. Each of these 3 stepper motor drivers can deliver a motor current
of up to 2A at 12V. For the NEMA42 or NEMA57 stepper motors typically used in CNC
milling/engraving machines, these stepper motor drivers offer more than enough power and do
not need to be operated at the upper end of their specification.
Hint:
During the first turn on, please set the current required for the stepper motors using the three miniature potentiometers
located on the board. This is described in more detail in a later chapter under the heading "Setting V
ref
".
Connection and operating elements
The following elements are located on the upper side of the control module, seen from left to right:
• Light emitting diodes for Spindle/Laser (blue), +12V (red), +24V(red)
• Connection for PWM-controlled 12V DC laser module (red)
• Connection for 24VDC spindle motor (white)
• Connection for stepper motor of X-axis (white)
• Connection for stepper motor of the Y-axis (white)
• Connection for stepper motor of Z-axis (white)
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